Which of the following preembryonic stages is paired incorrectly?
A. Cleavage: 3-72 hours
B. Morula: 3-4 days
C. Blastocyst: 14-16 days
D. Zygote: 0-30 hours
Answer: C
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Which type of epithelium is present where easy exchange of materials out of the blood is most important?
A) simple epithelium B) stratified squamous epithelium C) cuboidal epithelium D) endothelium E) columnar epithelium
Receptors that relay thermal information to the temperature control centers include
a. peripheral warm and cold thermoreceptors in the skin b. central thermoreceptors in the hypothalamus c. central thermoreceptors in internal organs d. both a and c e. all of the above
Into which vein does blood in the external jugular vein drain?
What will be an ideal response?
Curare blocks acetylcholine receptors at the motor end plate. This would result in
A. increased stimulation of the muscle. B. more acetylcholinesterase production. C. lack of calcium uptake by the muscle fiber. D. inability of the muscle fiber to respond to nervous stimulation. E. sustained contraction of the muscle.